Power supply system and control method thereof

Abstract

The invention discloses a power supply system and a control method thereof. The system comprises a battery module; the first end of the conversion module is electrically connected with the power supply end of the battery module; the switch module comprises a first switch unit and a second switch unit, and the third end of the second switch unit is electrically connected with the second end of the conversion module through the first switch unit; the external connection module comprises a first external connection unit and a second external connection unit, the first external connection unit and the second external connection unit correspond to different alternating currents respectively, the first external connection unit is electrically connected with the first end of the second switch unit, and the second external connection unit is electrically connected with the second end of the second switch unit; the different alternating currents comprise alternating currents of different phases and alternating currents of different voltages; the conversion module is used for achieving conversion between different alternating currents and direct currents of the battery module, alternating currents of the corresponding phase number can be selectively output through the first external unit and / or the second external unit according to needs, and alternating currents of different phase numbers and different voltages can be output through one set of power source.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply system and a control method thereof. Background Art

[0002] In related technologies, a power supply usually converts the DC power of its lithium battery directly into an AC output with a fixed number of phases and a certain voltage through an inverter. Therefore, if different AC powers are desired, multiple power supplies are usually required. Summary of the Invention

[0003] In order to solve the above technical problems, the embodiments of the present application propose a power supply system and a control method thereof, which can output different alternating currents through a set of power supplies.

[0004] In a first aspect, an embodiment of the present application provides a power supply system, including:

[0005] Battery modules;

[0006] a conversion module, a first end of which is electrically connected to a power supply end of the battery module;

[0007] a switch module comprising a first switch unit and a second switch unit, wherein the third end of the second switch unit is electrically connected to the second end of the conversion module via the first switch unit;

[0008] an external module, comprising a first external unit and a second external unit, wherein the first external unit and the second external unit correspond to different alternating currents, respectively, the first external unit being electrically connected to a first end of the second switch unit, and the second external unit being electrically connected to a second end of the second switch unit, wherein the different alternating currents include alternating currents of different phases and / or alternating currents of different voltages;

[0009] The conversion module is used to realize the conversion between the different alternating currents and the direct current of the battery module.

[0010] Optionally, the number of AC phases corresponding to the first external unit is single-phase, and the second external unit includes a split-phase external unit and / or a three-phase external unit;

[0011] The first external connection unit is electrically connected to a first sub-end of the second end of the second switch unit;

[0012] In the case where the second external connection unit includes a split-phase external connection unit, the split-phase external connection unit is electrically connected to the second sub-end of the second end of the second switch unit;

[0013] In the case where the second external connection unit includes a three-phase external connection unit, the three-phase external connection unit is electrically connected to the third sub-end of the second end of the second switch unit;

[0014] The first sub-terminal, the second sub-terminal and the third sub-terminal are electrically connected to the second external unit respectively.

[0015] Optionally, the first sub-end of the second end of the second switch unit includes an eleventh switch and a twelfth switch, the eleventh switch is electrically connected to the neutral line port of the first external unit, and the twelfth switch is electrically connected to the live line port of the first external unit;

[0016] In a case where the second external unit includes a split-phase external unit, the second sub-end of the second end of the second switch unit includes a thirteenth switch, a fourteenth switch, and a fifteenth switch, the thirteenth switch is electrically connected to the first live wire port of the split-phase external unit, the fourteenth switch is electrically connected to the neutral wire port of the split-phase external unit, and the fifteenth switch is electrically connected to the second live wire port of the split-phase external unit;

[0017] In the case where the second external unit includes a three-phase external unit, the third sub-end of the second end of the second switch unit includes a sixteenth switch, a seventeenth switch, an eighteenth switch, and a nineteenth switch, the sixteenth switch is electrically connected to the first live wire port of the three-phase external unit, the seventeenth switch is electrically connected to the second live wire port of the three-phase external unit, the eighteenth switch is electrically connected to the neutral wire port of the three-phase external unit, and the nineteenth switch is electrically connected to the third live wire port of the three-phase external unit.

[0018] Optionally, the conversion module includes a first inverter unit and a second inverter unit, the first end of the conversion module includes a power supply end of each of the first inverter unit and the second inverter unit, the first end of the first inverter unit is electrically connected to a neutral port of the first external unit via the eleventh switch, and the second end of the first inverter unit is electrically connected to a live port of the first external unit via the twelfth switch;

[0019] The first switch unit includes a first switch and a second switch, one end of the first switch is electrically connected between the first end of the first inverter unit and the eleventh switch, and the other end of the first switch is electrically connected to the first end of the second inverter unit, one end of the second switch is electrically connected between the second end of the first inverter unit and the twelfth switch, and the other end of the second switch is electrically connected to the second end of the second inverter unit.

[0020] Optionally, when the second external connection unit includes a split-phase external connection unit and does not include a three-phase external connection unit:

[0021] The first live wire port of the split-phase external connection unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the thirteenth switch, the neutral wire port of the split-phase external connection unit is electrically connected between the first end of the second inverter unit and the first switch via the fourteenth switch, and the second live wire port of the split-phase external connection unit is electrically connected between the second end of the second inverter unit and the second switch via the fifteenth switch;

[0022] or,

[0023] The conversion module also includes a third inverter unit and a fourth inverter unit. The first end of the conversion module also includes the power supply end of each of the third inverter unit and the fourth inverter unit. The first switch unit also includes a third switch, a fourth switch, a fifth switch and a sixth switch. The two ends of the third switch are electrically connected to the first end of the second inverter unit and the first end of the third inverter unit, respectively. The two ends of the fourth switch are electrically connected to the second end of the second inverter unit and the second end of the third inverter unit, respectively. The two ends of the fifth switch are electrically connected to the first end of the third inverter unit and the first end of the fourth inverter unit, respectively. The two ends of the sixth switch are electrically connected to the second end of the third inverter unit and the second end of the fourth inverter unit, respectively. The first live wire port of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the thirteenth switch. The neutral wire port of the split-phase external unit is electrically connected between the first end of the fourth inverter unit and the fifth switch via the fourteenth switch. The second live wire port of the split-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch via the fifteenth switch.

[0024] Optionally, when the second external connection unit includes a three-phase external connection unit and does not include a split-phase external connection unit:

[0025] The conversion module further includes a third inverter unit, the first end of the conversion module further includes a power supply end of the third inverter unit, the first switch unit further includes a third switch and a fourth switch, the two ends of the third switch are electrically connected to the first end of the second inverter unit and the first end of the third inverter unit, respectively, and the two ends of the fourth switch are electrically connected to the second end of the second inverter unit and the second end of the third inverter unit, respectively.

[0026] The first live wire port of the three-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the sixteenth switch, the second live wire port of the three-phase external unit is electrically connected between the second end of the second inverter unit and the second switch via the seventeenth switch, the neutral wire port of the three-phase external unit is electrically connected between the first end of the third inverter unit and the third switch via the eighteenth switch, and the third live wire port of the three-phase external unit is electrically connected between the second end of the third inverter unit and the fourth switch via the nineteenth switch.

[0027] Optionally, when the second external unit includes a split-phase external unit and a three-phase external unit:

[0028] The conversion module further includes a third inverter unit, a fourth inverter unit, a fifth inverter unit, and a sixth inverter unit; the first end of the conversion module further includes power supply ends of the third inverter unit, the fourth inverter unit, the fifth inverter unit, and the sixth inverter unit; and the first switch unit further includes a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch;

[0029] Two terminals of the third switch are electrically connected to the first terminal of the second inverter unit and the first terminal of the third inverter unit, respectively; two terminals of the fourth switch are electrically connected to the second terminal of the second inverter unit and the second terminal of the third inverter unit, respectively; two terminals of the fifth switch are electrically connected to the first terminal of the third inverter unit and the first terminal of the fourth inverter unit, respectively; two terminals of the sixth switch are electrically connected to the second terminal of the third inverter unit and the second terminal of the fourth inverter unit, respectively; two terminals of the seventh switch are electrically connected to the first terminal of the fourth inverter unit and the first terminal of the fifth inverter unit, respectively; two terminals of the eighth switch are electrically connected to the second terminal of the fourth inverter unit and the second terminal of the fifth inverter unit, respectively; two terminals of the ninth switch are electrically connected to the first terminal of the fifth inverter unit and the first terminal of the sixth inverter unit, respectively; and two terminals of the tenth switch are electrically connected to the second terminal of the fifth inverter unit and the second terminal of the sixth inverter unit, respectively;

[0030] The first live port of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the thirteenth switch, the neutral port of the split-phase external unit is electrically connected between the first end of the fourth inverter unit and the fifth switch via the fourteenth switch, the second live port of the split-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch via the fifteenth switch, the first live port of the three-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the sixteenth switch, the second live port of the three-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch via the seventeenth switch, the neutral port of the three-phase external unit is electrically connected between the first end of the sixth inverter unit and the ninth switch via the eighteenth switch, and the third live port of the three-phase external unit is electrically connected to the second end of the sixth inverter unit via the nineteenth switch;

[0031] in,

[0032] The battery module includes six lithium batteries, and the six lithium batteries correspond one by one to the first inverter unit, the second inverter unit, the third inverter unit, the fourth inverter unit, the fifth inverter unit, and the sixth inverter unit.

[0033] Optionally, the system further comprises:

[0034] The output control interaction module is used to detect user operations to generate output instructions, wherein the output instructions are at least used to control the conversion module and the switch module.

[0035] In a second aspect, an embodiment of the present application provides a control method for a power supply system applicable to any one of the first aspects above, wherein the power supply system further includes a control module, and the method is executed by the control module and includes:

[0036] In response to an output instruction, controlling the first switch unit to switch to a voltage mode matching a target output mode indicated by the output instruction, and controlling the conversion module to output according to the voltage mode via its second terminal; and

[0037] According to the target output mode, the conduction state of the first terminal and / or the second terminal of the second switch unit is controlled.

[0038] Optionally, the method further includes:

[0039] After controlling the conversion module to output according to the voltage mode via the second end thereof, detecting first parameter information corresponding to the output of the second end of the conversion module, and when it is determined that the first parameter information meets a normal output condition, performing the step of controlling the conduction state of the first end and / or the second end of the second switch unit;

[0040] and / or,

[0041] After controlling the conduction state of the first end and / or the second end of the second switch unit, detecting second parameter information corresponding to the output of each conductive end of the first end and the second end of the second switch unit, and disconnecting the conductive ends and / or turning off the conversion module when it is determined that the second parameter information meets an abnormal condition.

[0042] In summary, the embodiments of the present application have at least the following beneficial effects:

[0043] The power supply system of an embodiment of the present application includes: a battery module; a conversion module, a first end of which is electrically connected to the power supply end of the battery module; a switch module, which includes a first switch unit and a second switch unit, and the third end of the second switch unit is electrically connected to the second end of the conversion module via the first switch unit; an external module, which includes a first external unit and a second external unit, the first external unit and the second external unit respectively corresponding to different alternating currents, the first external unit is electrically connected to the first end of the second switch unit, and the second external unit is electrically connected to the second end of the second switch unit, wherein the different alternating currents include alternating currents of different phases and / or alternating currents of different voltages; wherein the conversion module is used to realize conversion between the different alternating currents and the direct current of the battery module. By using the embodiment of the present application, the conversion module can realize the conversion between AC power corresponding to different numbers of AC phases and DC power of the battery module. If one or more types of AC power need to be output, the DC power can be first converted into the AC power to be output by the conversion module, and then the AC power can be output respectively through the corresponding external units. Similarly, the external AC power can be connected to the corresponding external unit, and then the conversion module converts the external AC power into DC power to charge the battery module. Therefore, according to needs, AC power of the corresponding number of phases can be selectively output through the first external unit and / or the second external unit, so that AC power of different phases and different voltages can be output through a set of power supplies. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic diagram of the structure of the power supply system provided in an embodiment of the present application;

[0045] Figure 2 is another schematic diagram of a power supply system provided in an embodiment of the present application;

[0046] Figure 3 is another schematic diagram of a power supply system provided in an embodiment of the present application;

[0047] Figure 4A is a circuit diagram of a power supply system provided in an embodiment of the present application;

[0048] Figure 4B The embodiment of this application provides Figure 4A Schematic diagram of the corresponding power supply system;

[0049] Figure 5A is a circuit diagram of a power supply system provided in an embodiment of the present application;

[0050] Figure 5B The embodiment of this application provides Figure 5A Schematic diagram of the corresponding power supply system;

[0051] Figure 6A is a circuit diagram of a power supply system provided in an embodiment of the present application;

[0052] Figure 6B The embodiment of this application provides Figure 6A Schematic diagram of the corresponding power supply system;

[0053] Figure 7 is a circuit diagram of a power supply system provided in an embodiment of the present application;

[0054] Figure 8 is a circuit diagram of an inverter provided in an embodiment of the present application;

[0055] Figure 9 is another circuit diagram of the inverter provided in an embodiment of the present application;

[0056] Figure 10 1 is a flow chart of a method for controlling a power supply system provided in an embodiment of the present application;

[0057] Figure 11 It is a schematic diagram of a computer device provided in an embodiment of the present application.

[0058] Reference numerals:

[0059] 101. Battery module; 102. Conversion module; 103. Switch module; 104. External module

[0060] 301, first switch unit; 302, second switch unit;

[0061] 401, first external unit; 402, second external unit;

[0062] K1, first switch; K2, second switch; K3, third switch; K4, fourth switch; K5, fifth switch; K6, sixth switch; K7, seventh switch; K8, eighth switch; K9, ninth switch; K10, tenth switch; K11, eleventh switch; K12, twelfth switch; K13, thirteenth switch; K14, fourteenth switch; K15, fifteenth switch; K16, sixteenth switch; K17, seventeenth switch; K18, eighteenth switch; K19, nineteenth switch;

[0063] N1, neutral line port of the first external unit; L11, live line port of the first external unit;

[0064] N2, the neutral line port of the split-phase external unit; L21, the first live line port of the split-phase external unit; L22, the second live line port of the split-phase external unit;

[0065] N3, the neutral line port of the three-phase external unit; L31, the first live line port of the three-phase external unit;

[0066] L32, the second live wire port of the three-phase external unit; L33, the third live wire port of the three-phase external unit. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0068] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "multiple" means two or more. In the description of this application, the term "including" and its variations are open inclusions, i.e., "including but not limited to". The term "based on" means "at least partially based on". The term "according to" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments".

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0070] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. Those of ordinary skill in the art will understand the specific meanings of the above terms in this application in specific circumstances.

[0071] First, see Figure 1 , shows a schematic structural diagram of a power supply system provided in an embodiment of the present application, the power supply system comprising:

[0072] Battery module 101;

[0073] a conversion module 102, a first end of which is electrically connected to a power supply end of the battery module 101;

[0074] The switch module 103 includes a first switch unit 301 and a second switch unit 302 , wherein the third terminal of the second switch unit 302 is electrically connected to the second terminal of the conversion module 102 via the first switch unit 301 ;

[0075] The external module 104 includes a first external unit 401 and a second external unit 402, wherein the first external unit 401 and the second external unit 402 correspond to different alternating currents, respectively. The first external unit 401 is electrically connected to a first end of the second switch unit 302, and the second external unit 402 is electrically connected to a second end of the second switch unit 302. The different alternating currents include alternating currents of different phases and / or alternating currents of different voltages.

[0076] The conversion module 102 is used to realize the conversion between the different alternating currents and the direct current of the battery module 101 .

[0077] In an example, the different alternating currents may include: alternating currents of the same phase and different voltages, alternating currents of different phases and different voltages, alternating currents of different phases and the same voltage, and the like.

[0078] In one example, the power supply system may further include a control module, which may be configured to: in response to an output instruction, control the first switch unit to switch to a voltage mode matching the target output mode indicated by the output instruction, and control the conversion module to output according to the voltage mode via its second end; and, according to the target output mode, control the conduction state of the first end and / or the second end of the second switch unit.

[0079] Continuing with the above example, the control module can also be configured as:

[0080] After controlling the conversion module to output according to the voltage mode via the second end thereof, detecting first parameter information corresponding to the output of the second end of the conversion module, and when it is determined that the first parameter information meets a normal output condition, performing the step of controlling the conduction state of the first end and / or the second end of the second switch unit;

[0081] and / or,

[0082] After controlling the conduction state of the first end and / or the second end of the second switch unit, detecting second parameter information corresponding to the output of each conductive end of the first end and the second end of the second switch unit, and disconnecting the conductive ends and / or turning off the conversion module when it is determined that the second parameter information meets an abnormal condition.

[0083] Following the above example, see Figure 2 and Figure 3 The power supply system may also include an output control button, the battery module 101 may include a lithium battery, the control module may be a control center, the conversion module 102 may include inverters 1 to 6, the switch module 103 may be a switch matrix, the first switch unit 301 may be a left voltage mode switching switch, the second switch unit 302 may be a right port output switch, the first external unit 401 may be an AC single-phase output, and the second external unit 402 may be an AC split-phase output and / or an AC three-phase output. The control center may be used to perform inversion control on the conversion module 102, to detect the inversion phase between the conversion module 102 and the switch module 103, to control the switch module 103, to detect the output phase between the switch module 103 and the first external unit 401 and / or the second external unit 402, and to receive the button control signal of the output control button. The yellow connecting lines shown in the figures of this application all represent grounding lines.

[0084] Continuing with the above example, the control module can also be configured as:

[0085] When it is detected that the power supply system is powered on, all switches in the switch module 103 are disconnected by default, and a self-test of the entire machine is performed. After the self-test result indicates that it is normal, the system enters the standby state. The control module will respond to the above output instructions only in the standby state.

[0086] In an optional embodiment, the number of AC phases corresponding to the first external unit 401 is single-phase, and the second external unit 402 includes a split-phase external unit and / or a three-phase external unit;

[0087] The first external connection unit 401 is electrically connected to the first sub-end of the second end of the second switch unit 302;

[0088] In the case where the second external connection unit 402 includes a split-phase external connection unit, the split-phase external connection unit is electrically connected to the second sub-end of the second end of the second switch unit 302;

[0089] In the case where the second external connection unit 402 includes a three-phase external connection unit, the three-phase external connection unit is electrically connected to the third sub-end of the second end of the second switch unit 302;

[0090] The first sub-terminal, the second sub-terminal, and the third sub-terminal are electrically connected to the second external unit 402 respectively.

[0091] In one example, under normal circumstances, the first external unit 401 , the split-phase external unit, and the three-phase external unit are independent of each other and any one of them is in a working state.

[0092] In an optional embodiment, the first sub-end of the second end of the second switch unit 302 includes an eleventh switch K11 and a twelfth switch K12, the eleventh switch K11 is electrically connected to the neutral line port N1 of the first external unit 401, and the twelfth switch K12 is electrically connected to the live line port L11 of the first external unit 401;

[0093] In the case where the second external unit 402 includes a split-phase external unit, the second sub-end of the second end of the second switch unit 302 includes a thirteenth switch K13, a fourteenth switch K14, and a fifteenth switch K15, the thirteenth switch K13 being electrically connected to the first live wire port L21 of the split-phase external unit, the fourteenth switch K14 being electrically connected to the neutral wire port N2 of the split-phase external unit, and the fifteenth switch K15 being electrically connected to the second live wire port L22 of the split-phase external unit;

[0094] In the case where the second external unit 402 includes a three-phase external unit, the third sub-end of the second end of the second switch unit 302 includes a sixteenth switch K16, a seventeenth switch K17, an eighteenth switch K18, and a nineteenth switch K19, the sixteenth switch K16 is electrically connected to the first live wire port L31 of the three-phase external unit, the seventeenth switch K17 is electrically connected to the second live wire port L32 of the three-phase external unit, the eighteenth switch K18 is electrically connected to the neutral wire port N3 of the three-phase external unit, and the nineteenth switch K19 is electrically connected to the third live wire port L33 of the three-phase external unit.

[0095] In an optional embodiment, the conversion module 102 includes a first inverter unit and a second inverter unit. The first end of the conversion module 102 includes a power supply end of each of the first inverter unit and the second inverter unit. The first end of the first inverter unit is electrically connected to the neutral line port N1 of the first external unit 401 via the eleventh switch K11, and the second end of the first inverter unit is electrically connected to the live line port L11 of the first external unit 401 via the twelfth switch K12.

[0096] The first switch unit 301 includes a first switch K1 and a second switch K2, one end of the first switch K1 is electrically connected between the first end of the first inverter unit and the eleventh switch K11, the other end of the first switch K1 is electrically connected to the first end of the second inverter unit, one end of the second switch K2 is electrically connected between the second end of the first inverter unit and the twelfth switch K12, and the other end of the second switch K2 is electrically connected to the second end of the second inverter unit.

[0097] In an optional implementation, when the second external connection unit 402 includes a split-phase external connection unit and does not include a three-phase external connection unit:

[0098] The first live wire port L21 of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch K12 via the thirteenth switch K13, the neutral wire port N2 of the split-phase external unit is electrically connected between the first end of the second inverter unit and the first switch K1 via the fourteenth switch K14, and the second live wire port L22 of the split-phase external unit is electrically connected between the second end of the second inverter unit and the second switch K2 via the fifteenth switch K15.

[0099] Specifically, see Figure 4A and Figure 4BIf only single-phase AC power and split-phase AC power are required and three-phase AC power is not required, this embodiment can achieve the relevant technical effects by using only two inverter units, namely the first inverter unit (i.e., inverter 1) and the second inverter unit (i.e., inverter 2) and seven switches.

[0100] or,

[0101] The conversion module 102 further includes a third inverter unit and a fourth inverter unit. The first end of the conversion module 102 further includes the power supply end of the third inverter unit and the fourth inverter unit. The first switch unit 301 further includes a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6. The two ends of the third switch K3 are electrically connected to the first end of the second inverter unit and the first end of the third inverter unit, respectively. The two ends of the fourth switch K4 are electrically connected to the second end of the second inverter unit and the second end of the third inverter unit, respectively. The two ends of the fifth switch K5 are electrically connected to the first end of the third inverter unit and the fourth inverter unit, respectively. The first end of the unit, the two ends of the sixth switch K6 are respectively electrically connected to the second end of the third inverter unit and the second end of the fourth inverter unit, the first live wire port L21 of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch K12 via the thirteenth switch K13, the neutral line port N2 of the split-phase external unit is electrically connected between the first end of the fourth inverter unit and the fifth switch K5 via the fourteenth switch K14, and the second live wire port L22 of the split-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch K6 via the fifteenth switch K15.

[0102] Specifically, see Figure 5A and Figure 5B If only single-phase AC power and split-phase AC power are required and three-phase AC power is not required, this embodiment can also use four inverter units, namely the first inverter unit (i.e., inverter 1), the second inverter unit (i.e., inverter 2), the third inverter unit (i.e., inverter 3) and the fourth inverter unit (i.e., inverter 4), and eleven switches to achieve the relevant technical effects.

[0103] In an optional implementation, when the second external connection unit 402 includes a three-phase external connection unit and does not include a split-phase external connection unit:

[0104] The conversion module 102 further includes a third inverter unit, the first end of the conversion module 102 further includes a power supply end of the third inverter unit, the first switch unit 301 further includes a third switch K3 and a fourth switch K4, the third switch K3 has two ends electrically connected to the first end of the second inverter unit and the first end of the third inverter unit, respectively, and the fourth switch K4 has two ends electrically connected to the second end of the second inverter unit and the second end of the third inverter unit, respectively.

[0105] The first live wire port L31 of the three-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch K12 via the sixteenth switch K16. The second live wire port L32 of the three-phase external unit is electrically connected between the second end of the second inverter unit and the second switch K2 via the seventeenth switch K17. The neutral wire port N3 of the three-phase external unit is electrically connected between the first end of the third inverter unit and the third switch K3 via the eighteenth switch K18. The third live wire port L33 of the three-phase external unit is electrically connected between the second end of the third inverter unit and the fourth switch K4 via the nineteenth switch K19.

[0106] Specifically, see Figure 6A and Figure 6B If only single-phase AC power and three-phase AC power are required, and split-phase AC power is not required, this embodiment can use a first inverter unit (i.e., inverter 1), a second inverter unit (i.e., inverter 2) and a third inverter unit (i.e., inverter 3), as well as ten switches to achieve relevant technical effects.

[0107] In an optional implementation, when the second external unit 402 includes a split-phase external unit and a three-phase external unit:

[0108] The conversion module 102 further includes a third inverter unit, a fourth inverter unit, a fifth inverter unit, and a sixth inverter unit. The first end of the conversion module 102 further includes power supply ends of the third inverter unit, the fourth inverter unit, the fifth inverter unit, and the sixth inverter unit. The first switch unit 301 further includes a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, and a tenth switch K10.

[0109] Two terminals of the third switch K3 are electrically connected to the first terminal of the second inverter unit and the first terminal of the third inverter unit, respectively. Two terminals of the fourth switch K4 are electrically connected to the second terminal of the second inverter unit and the second terminal of the third inverter unit, respectively. Two terminals of the fifth switch K5 are electrically connected to the first terminal of the third inverter unit and the first terminal of the fourth inverter unit, respectively. Two terminals of the sixth switch K6 are electrically connected to the second terminal of the third inverter unit and the second terminal of the fourth inverter unit, respectively. Two terminals of the seventh switch K7 are electrically connected to the first terminal of the fourth inverter unit and the first terminal of the fifth inverter unit, respectively. Two terminals of the eighth switch K8 are electrically connected to the second terminal of the fourth inverter unit and the second terminal of the fifth inverter unit, respectively. Two terminals of the ninth switch K9 are electrically connected to the first terminal of the fifth inverter unit and the first terminal of the sixth inverter unit, respectively. Two terminals of the tenth switch K10 are electrically connected to the second terminal of the fifth inverter unit and the second terminal of the sixth inverter unit, respectively.

[0110] The first live wire port L21 of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch K12 via the thirteenth switch K13. The neutral wire port N2 of the split-phase external unit is electrically connected between the first end of the fourth inverter unit and the fifth switch K5 via the fourteenth switch K14. The second live wire port L22 of the split-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch K6 via the fifteenth switch K15. The first live wire port L31 of the three-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch K6 via the fifteenth switch K15. The sixteenth switch K16 is electrically connected between the second end of the first inverter unit and the twelfth switch K12. The second live wire port L32 of the three-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch K6 via the seventeenth switch K17. The neutral wire port N3 of the three-phase external unit is electrically connected between the first end of the sixth inverter unit and the ninth switch K9 via the eighteenth switch K18. The third live wire port L33 of the three-phase external unit is electrically connected to the second end of the sixth inverter unit via the nineteenth switch K19.

[0111] in,

[0112] The battery module 101 includes six lithium batteries, and the six lithium batteries correspond one by one to the first inverter unit (i.e., inverter 1), the second inverter unit (i.e., inverter 2), the third inverter unit (i.e., inverter 3), the fourth inverter unit (i.e., inverter 4), the fifth inverter unit (i.e., inverter 5) and the sixth inverter unit (i.e., inverter 6).

[0113] Specifically, see Figure 7 , combined with Figure 7To illustrate the principle of AC power output achieved in the relevant embodiments of the present application, it is first assumed that the inverters 1 to 6 are all identical inverters and each outputs the same voltage to the switch module 103 .

[0114] 1. Single-phase output mode:

[0115] K1 to K10 are all closed, so that inverters 1 to 6 are connected in parallel and output in one direction, forming a 1S6P (consisting of 6 identical power supplies connected in parallel without additional series connection) output mode;

[0116] K11~12 are closed, K13~19 are open, N1 and L11 output in one direction, and the power is 6 times the output of the inverter.

[0117] 2. Split-phase output mode:

[0118] K1, K3, K5, K7, and K9 are all closed, K2 and K4 are closed, K6 is open, and K8 and K10 are closed, so that inverters 1 to 3 are controlled to be connected in parallel, and inverters 4 to 6 are controlled to be connected in parallel. Then, the parallel inverters 1 to 3 are connected in series with the parallel inverters 4 to 6, thus forming a 2S3P (three identical power supplies are connected in parallel to form a group of parallel power supplies, and two groups of parallel power supplies are connected in series) output mode;

[0119] K13~15 are closed, K11~12 and K16~19 are opened, so that N2, L21 and L22 are split-phase output, and the phase difference between L21 and L22 is 180 degrees, and the power is 6 times the output of the inverter.

[0120] 3. Three-phase output mode:

[0121] K1, K3, K5, K7, and K9 are all closed, K2 is closed, K4 is open, K6 is closed, K8 is open, and K10 is closed, so that inverters 1 and 2 are connected in parallel, inverters 3 and 4 are connected in parallel, and inverters 5 and 6 are connected in parallel. The three parallel inverter groups are then connected in series to form a 3S2P (two identical power supplies are connected in parallel to form one parallel power supply, and three parallel power supplies are connected in series) output mode;

[0122] K16~19 are closed, K11~15 are disconnected, N3, L31, L32, L33 three-phase output, the phase difference between L31, L32, L33 is 120 degrees, and the power is 6 times the output of the inverter.

[0123] In addition, it should be understood that in the relevant embodiments in which the above-mentioned second external unit includes a split-phase external unit and does not include a three-phase external unit, and in the relevant embodiments in which the above-mentioned second external unit includes a three-phase external unit and does not include a split-phase external unit, the principle used to achieve the output of alternating current of different phases (the on and off of different switches) is the same as that of the present embodiment and will not be repeated here.

[0124] In addition, it is understood that in any relevant embodiment of this application, see Figure 2 , each inverter is connected to a different lithium battery, or Figure 3 As shown, different inverters can be connected to the same lithium battery.

[0125] In an optional embodiment, the system further includes:

[0126] The output control interaction module is used to detect user operations to generate output instructions, wherein the output instructions are at least used to control the conversion module 102 and the switch module 103.

[0127] In addition, the first to sixth inverter units (ie, inverters 1 to 6 ) described in any embodiment of the present application may have the same structure. Two examples are given below.

[0128] The first one, see Figure 8 The inverter can be a two-stage structure, with the front stage being a DC-DC isolated boost circuit structure 801 and the back stage being a buck inverter circuit structure 802. The DC-DC isolated boost circuit structure 801 can be used to boost the DC power of the battery module 101, and the buck inverter circuit structure 802 can be used to buck the voltage output by the DC-DC isolated boost circuit structure 801. The buck inverter circuit structure 802 includes an inductor Linv.

[0129] The second one, see Figure 9 The inverter also removes the front-stage DC-DC isolation boost circuit structure 801 and only retains the rear-stage buck inverter circuit structure 802. In this case, the DC voltage of the battery module 101 is required to exceed the peak value of the AC voltage.

[0130] Second, see Figure 10 , shows a flow chart of a control method for a power supply system applicable to any one of the first aspects described above, provided in an embodiment of the present application. The power supply system further includes a control module. The method is executed by the control module and includes steps S1001-S1002, specifically as follows:

[0131] S1001, in response to an output instruction, controlling the first switch unit 301 to switch to a voltage mode matching a target output mode indicated by the output instruction, and controlling the conversion module 102 to output according to the voltage mode via its second terminal; and

[0132] S1002 : Control the conduction state of the first terminal and / or the second terminal of the second switch unit 302 according to the target output mode.

[0133] In an optional embodiment, the method further includes:

[0134] After controlling the conversion module 102 to output according to the voltage mode via the second end thereof, detecting first parameter information corresponding to the output of the second end of the conversion module 102, and when it is determined that the first parameter information meets a normal output condition, performing the step of controlling the conduction state of the first end and / or the second end of the second switch unit 302;

[0135] and / or,

[0136] After controlling the conduction state of the first end and / or the second end of the second switch unit 302, the second parameter information corresponding to the output of each conductive end of the first end and the second end of the second switch unit 302 is detected. When it is determined that the second parameter information meets the abnormal condition, the conductive ends are disconnected and / or the conversion module 102 is turned off.

[0137] In one example, the method may further include:

[0138] When it is detected that the power supply system is powered on, all switches in the switch module 103 are disconnected by default, and a self-test of the entire machine is performed. After the self-test result indicates that it is normal, the system enters the standby state. The control module will respond to the above output instructions only in the standby state.

[0139] In a third aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above-mentioned control methods when executed by a processor.

[0140] In a fourth aspect, an embodiment of the present application provides a computer program product, comprising computer instructions, which, when executed by a processor, implement the steps of any of the control methods described above.

[0141] In a fifth aspect, an embodiment of the present application provides a computer device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the steps of any one of the control methods described above when executing the computer program.

[0142] See also Figure 11 The computer device of this embodiment includes: a processor 1001, a memory 1002, and a computer program stored in the memory 1002 and executable on the processor 1001, such as a control program. When the processor 1001 executes the computer program, the steps in the above-mentioned control method embodiments are implemented, such as Figure 1 Steps S1001-S1002 are shown.

[0143] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory 1002 and executed by the processor 1001 to implement the present application. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the computer device.

[0144] The computer device may be a desktop computer, laptop, PDA, cloud server, or other computing device. The computer device may include, but is not limited to, a processor 1001 and a memory 1002. Those skilled in the art will appreciate that the schematic diagram is merely an example of a computer device and does not limit the computer device. The computer device may include more or fewer components than shown, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, and the like.

[0145] The processor 1001 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor 1001 may be any conventional processor, etc. The processor 1001 is the control center of the computer device, connecting various parts of the entire computer device using various interfaces and lines.

[0146] The memory 1002 can be used to store the computer programs and / or modules. The processor 1001 implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory 1002 and calling the data stored in the memory 1002. The memory 1002 can mainly include a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created based on the use of the mobile phone (such as audio data, a phone book, etc.). In addition, the memory 1002 can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0147] Wherein, if the module / unit integrated in the computer device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program, when executed by the processor 1001, can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0148] In summary, the embodiments of the present application have at least the following beneficial effects:

[0149] The power supply system of an embodiment of the present application includes: a battery module; a conversion module, a first end of which is electrically connected to the power supply end of the battery module; a switch module, which includes a first switch unit and a second switch unit, and the third end of the second switch unit is electrically connected to the second end of the conversion module via the first switch unit; an external module, which includes a first external unit and a second external unit, the first external unit and the second external unit respectively corresponding to different alternating currents, the first external unit is electrically connected to the first end of the second switch unit, and the second external unit is electrically connected to the second end of the second switch unit, wherein the different alternating currents include alternating currents of different phases and / or alternating currents of different voltages; wherein the conversion module is used to realize conversion between the different alternating currents and the direct current of the battery module. By using the embodiment of the present application, the conversion module can realize the conversion between AC power corresponding to different numbers of AC phases and DC power of the battery module. If one or more types of AC power need to be output, the DC power can be first converted into the AC power to be output by the conversion module, and then the AC power can be output respectively through the corresponding external units. Similarly, the external AC power can be connected to the corresponding external unit, and then the conversion module converts the external AC power into DC power to charge the battery module. Therefore, according to needs, AC power of the corresponding number of phases can be selectively output through the first external unit and / or the second external unit, so that AC power of different phases and different voltages can be output through a set of power supplies.

[0150] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented by means of software plus the necessary hardware platform, and of course it can also be implemented entirely by hardware. Based on this understanding, all or part of the contribution of the technical solution of the present application to the background technology can be embodied in the form of a software product, and the computer software product can be stored in a storage medium, such as ROM (Read-Only Memory) / RAM (Random Access Memory), a disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application or certain parts of the embodiments.

[0151] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A power supply system, characterized in that: include: Battery modules; a conversion module, a first end of which is electrically connected to a power supply end of the battery module; a switch module comprising a first switch unit and a second switch unit, wherein the third end of the second switch unit is electrically connected to the second end of the conversion module via the first switch unit; an external module, comprising a first external unit and a second external unit, wherein the first external unit and the second external unit correspond to different alternating currents, respectively, the first external unit being electrically connected to a first end of the second switch unit, and the second external unit being electrically connected to a second end of the second switch unit, wherein the different alternating currents include alternating currents of different phases and / or alternating currents of different voltages; The conversion module is used to realize the conversion between the different alternating currents and the direct current of the battery module.

2. The system according to claim 1, wherein: The number of AC phases corresponding to the first external unit is single-phase, and the second external unit includes a split-phase external unit and / or a three-phase external unit; The first external connection unit is electrically connected to a first sub-end of the second end of the second switch unit; In the case where the second external connection unit includes a split-phase external connection unit, the split-phase external connection unit is electrically connected to the second sub-end of the second end of the second switch unit; In the case where the second external connection unit includes a three-phase external connection unit, the three-phase external connection unit is electrically connected to the third sub-end of the second end of the second switch unit; The first sub-terminal, the second sub-terminal and the third sub-terminal are electrically connected to the second external unit respectively.

3. The system according to claim 2, characterized in that The first sub-end of the second end of the second switch unit includes an eleventh switch and a twelfth switch, the eleventh switch is electrically connected to the neutral line port of the first external unit, and the twelfth switch is electrically connected to the live line port of the first external unit; In a case where the second external unit includes a split-phase external unit, the second sub-end of the second end of the second switch unit includes a thirteenth switch, a fourteenth switch, and a fifteenth switch, the thirteenth switch is electrically connected to the first live wire port of the split-phase external unit, the fourteenth switch is electrically connected to the neutral wire port of the split-phase external unit, and the fifteenth switch is electrically connected to the second live wire port of the split-phase external unit; In the case where the second external unit includes a three-phase external unit, the third sub-end of the second end of the second switch unit includes a sixteenth switch, a seventeenth switch, an eighteenth switch, and a nineteenth switch, the sixteenth switch is electrically connected to the first live wire port of the three-phase external unit, the seventeenth switch is electrically connected to the second live wire port of the three-phase external unit, the eighteenth switch is electrically connected to the neutral wire port of the three-phase external unit, and the nineteenth switch is electrically connected to the third live wire port of the three-phase external unit.

4. The system according to claim 3, characterized in that The conversion module includes a first inverter unit and a second inverter unit, wherein a first end of the conversion module includes a power supply end of each of the first inverter unit and the second inverter unit, a first end of the first inverter unit is electrically connected to a neutral line port of the first external unit via the eleventh switch, and a second end of the first inverter unit is electrically connected to a live line port of the first external unit via the twelfth switch; The first switch unit includes a first switch and a second switch, one end of the first switch is electrically connected between the first end of the first inverter unit and the eleventh switch, and the other end of the first switch is electrically connected to the first end of the second inverter unit, one end of the second switch is electrically connected between the second end of the first inverter unit and the twelfth switch, and the other end of the second switch is electrically connected to the second end of the second inverter unit.

5. The system according to claim 4, characterized in that In the case where the second external connection unit includes a split-phase external connection unit and does not include a three-phase external connection unit: The first live wire port of the split-phase external connection unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the thirteenth switch, the neutral wire port of the split-phase external connection unit is electrically connected between the first end of the second inverter unit and the first switch via the fourteenth switch, and the second live wire port of the split-phase external connection unit is electrically connected between the second end of the second inverter unit and the second switch via the fifteenth switch; or, The conversion module also includes a third inverter unit and a fourth inverter unit. The first end of the conversion module also includes the power supply end of each of the third inverter unit and the fourth inverter unit. The first switch unit also includes a third switch, a fourth switch, a fifth switch and a sixth switch. The two ends of the third switch are electrically connected to the first end of the second inverter unit and the first end of the third inverter unit, respectively. The two ends of the fourth switch are electrically connected to the second end of the second inverter unit and the second end of the third inverter unit, respectively. The two ends of the fifth switch are electrically connected to the first end of the third inverter unit and the first end of the fourth inverter unit, respectively. The two ends of the sixth switch are electrically connected to the second end of the third inverter unit and the second end of the fourth inverter unit, respectively. The first live wire port of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the thirteenth switch. The neutral wire port of the split-phase external unit is electrically connected between the first end of the fourth inverter unit and the fifth switch via the fourteenth switch. The second live wire port of the split-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch via the fifteenth switch.

6. The system according to claim 4, characterized in that In the case where the second external connection unit includes a three-phase external connection unit and does not include a split-phase external connection unit: The conversion module further includes a third inverter unit, the first end of the conversion module further includes a power supply end of the third inverter unit, the first switch unit further includes a third switch and a fourth switch, the two ends of the third switch are electrically connected to the first end of the second inverter unit and the first end of the third inverter unit, respectively, and the two ends of the fourth switch are electrically connected to the second end of the second inverter unit and the second end of the third inverter unit, respectively. The first live wire port of the three-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the sixteenth switch, the second live wire port of the three-phase external unit is electrically connected between the second end of the second inverter unit and the second switch via the seventeenth switch, the neutral wire port of the three-phase external unit is electrically connected between the first end of the third inverter unit and the third switch via the eighteenth switch, and the third live wire port of the three-phase external unit is electrically connected between the second end of the third inverter unit and the fourth switch via the nineteenth switch.

7. The system according to claim 4, wherein: In the case where the second external unit includes a split-phase external unit and a three-phase external unit: The conversion module further includes a third inverter unit, a fourth inverter unit, a fifth inverter unit, and a sixth inverter unit; the first end of the conversion module further includes power supply ends of the third inverter unit, the fourth inverter unit, the fifth inverter unit, and the sixth inverter unit; and the first switch unit further includes a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, and a tenth switch; Two terminals of the third switch are electrically connected to the first terminal of the second inverter unit and the first terminal of the third inverter unit, respectively; two terminals of the fourth switch are electrically connected to the second terminal of the second inverter unit and the second terminal of the third inverter unit, respectively; two terminals of the fifth switch are electrically connected to the first terminal of the third inverter unit and the first terminal of the fourth inverter unit, respectively; two terminals of the sixth switch are electrically connected to the second terminal of the third inverter unit and the second terminal of the fourth inverter unit, respectively; two terminals of the seventh switch are electrically connected to the first terminal of the fourth inverter unit and the first terminal of the fifth inverter unit, respectively; two terminals of the eighth switch are electrically connected to the second terminal of the fourth inverter unit and the second terminal of the fifth inverter unit, respectively; two terminals of the ninth switch are electrically connected to the first terminal of the fifth inverter unit and the first terminal of the sixth inverter unit, respectively; and two terminals of the tenth switch are electrically connected to the second terminal of the fifth inverter unit and the second terminal of the sixth inverter unit, respectively; The first live port of the split-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the thirteenth switch, the neutral port of the split-phase external unit is electrically connected between the first end of the fourth inverter unit and the fifth switch via the fourteenth switch, the second live port of the split-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch via the fifteenth switch, the first live port of the three-phase external unit is electrically connected between the second end of the first inverter unit and the twelfth switch via the sixteenth switch, the second live port of the three-phase external unit is electrically connected between the second end of the fourth inverter unit and the sixth switch via the seventeenth switch, the neutral port of the three-phase external unit is electrically connected between the first end of the sixth inverter unit and the ninth switch via the eighteenth switch, and the third live port of the three-phase external unit is electrically connected to the second end of the sixth inverter unit via the nineteenth switch; in, The battery module includes six lithium batteries, and the six lithium batteries correspond one by one to the first inverter unit, the second inverter unit, the third inverter unit, the fourth inverter unit, the fifth inverter unit, and the sixth inverter unit.

8. The system according to any one of claims 1 to 7, characterized in that: The system further comprises: The output control interaction module is used to detect user operations to generate output instructions, wherein the output instructions are at least used to control the conversion module and the switch module.

9. A control method for the power supply system according to any one of claims 1 to 8, characterized in that: The power supply system further includes a control module, and the method is executed by the control module and includes: In response to an output instruction, controlling the first switch unit to switch to a voltage mode matching a target output mode indicated by the output instruction, and controlling the conversion module to output according to the voltage mode via its second terminal; and According to the target output mode, the conduction state of the first terminal and / or the second terminal of the second switch unit is controlled.

10. The method according to claim 9, characterized in that The method further comprises: After controlling the conversion module to output according to the voltage mode via the second end thereof, detecting first parameter information corresponding to the output of the second end of the conversion module, and when it is determined that the first parameter information meets a normal output condition, performing the step of controlling the conduction state of the first end and / or the second end of the second switch unit; and / or, After controlling the conduction state of the first end and / or the second end of the second switch unit, detecting second parameter information corresponding to the output of each conductive end of the first end and the second end of the second switch unit, and disconnecting the conductive ends and / or turning off the conversion module when it is determined that the second parameter information meets an abnormal condition.

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